Servlet – Load on startup
The element ‘load-on-startup‘ is used to load the servlet. The ‘void init()‘ method of servlet gets executed when the server gets started. The element content of ‘load-on-startup’ is Integer.
- if the integer is negative: The container loads servlet at any time.
- if the integer is 0 or positive: The servlet marked with lower integers are loaded before servlets marked with higher integers.
How to add element load-on-startup while mapping servlet?
The load-on-startup is the sub-attribute of servlet attribute in web.xml. We do mapping of servlet in web.xml file.
In XML file
XML
< servlet > < servlet-name >servletOne</ servlet-name > < servlet-class >com.gfg.ServletOne</ servlet-class > < load-on-startup >0</ load-on-startup > </ servlet > < servlet > < servlet-name >servletTwo</ servlet-name > < servlet-class >com.gfg.ServletTwo</ servlet-class > < load-on-startup >1</ load-on-startup > </ servlet > |
ServletOne load first then ServletTwo get load.
Servlet Code
servletOne.java
Java
package com.gfg; import javax.servlet.*; import javax.servlet.http.*; import java.io.*; public class ServletOne extends HttpServlet { public void init() { // this method will get execute // when the server get start System.out.println( "ServletOne got called" ); } } |
servletTwo.java
Java
package com.gfg; import javax.servlet.*; import javax.servlet.http.*; import java.io.*; public class ServletTwo extends HttpServlet { public void init() { // this method will get execute // when the server get start System.out.println( "ServletTwo got called" ); } } |
Note: the above code is server-side code it will not work on online IDE (it is only for the clarification of the topic).
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